and many more benefits!

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GMAT Club Timer Informer

Hi GMATClubber!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

consider one-digit numbers: the only zero is there, 1.
consider two-digit numbers: a zero cannot be on the first place; it can be only on the second; thus, 9*1=9
consider three-digit numbers: with one zero--2*9*9; with two zeroes--9*2=18, total--180
consider four-digit numbers: with one zero--3*9*9*9; with two zeroes-- 3*9*9*2; with three zeroes--9*3; total-- 2700
consider 10000: 4 zeroes